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Stephan T. Lavavej211056d2017-08-31 17:59:42 +000015 <a href="https://llvm.org/">LLVM Home</a>
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34 <!--*********************************************************************-->
35 <h1>libc++ C++2a Status</h1>
36 <!--*********************************************************************-->
37
38 <p>In July 2017, the C++ standard committee created a draft for the next version of the C++ standard, known here as "C++2a" (probably to be C++20).</p>
Stephan T. Lavavej211056d2017-08-31 17:59:42 +000039 <p>This page shows the status of libc++; the status of clang's support of the language features is <a href="https://clang.llvm.org/cxx_status.html#cxx2a">here</a>.</p>
Marshall Clowbee8eb92017-07-16 23:59:23 +000040
Marshall Clowee66b1f2017-07-27 17:44:03 +000041 <p>Reminder: Features in unreleased drafts of the standard are subject to change.</p>
42
Marshall Clowbee8eb92017-07-16 23:59:23 +000043 <p>The groups that have contributed papers:
44 <ul>
45 <li>LWG - Library working group</li>
46 <li>CWG - Core Language Working group</li>
47 <li>SG1 - Study group #1 (Concurrency working group)</li>
48 </ul>
49 </p>
50
51 <h3>Paper Status</h3>
52 <table id="papers" border="1">
53 <tr><th>Paper #</th><th>Group</th><th>Paper Name</th><th>Meeting</th><th>Status</th><th>First released version</th></tr>
54<!--
Stephan T. Lavavej952bcd12017-08-31 17:59:39 +000055 <tr><td><a href="https://wg21.link/n3346">3346</a></td><td>LWG</td><td>Terminology for Container Element Requirements - Rev 1</td><td>Kona</td><td>Complete</td><td>3.4</td></tr>
Marshall Clowbee8eb92017-07-16 23:59:23 +000056-->
Marshall Clow4e732c72017-11-02 14:53:08 +000057 <tr><td><a href="https://wg21.link/P0463R1">P0463R1</a></td><td>LWG</td><td>Endian just Endian</td><td>Toronto</td><td>In progress</td><td></td></tr>
Marshall Clowbee8eb92017-07-16 23:59:23 +000058 <tr><td><a href="https://wg21.link/P0674R1">P0674R1</a></td><td>LWG</td><td>Extending make_shared to Support Arrays</td><td>Toronto</td><td></td><td></td></tr>
59
60<!-- <tr><td></td><td></td><td></td><td></td><td></td><td></td></tr> -->
61 </table>
62
63<p><i>[ Note: "Nothing to do" means that no library changes were needed to implement this change -- end note]</i></p>
64
65 <h3>Library Working group Issues Status</h3>
66<!-- <I>Note: "NAD" means that the issue was deemed "Not a defect"</I> -->
67 <table id="issues" border="1">
68 <tr><th>Issue #</th><th>Issue Name</th><th>Meeting</th><th>Status</th></tr>
69<!--
Stephan T. Lavavej4e745042017-08-31 17:59:33 +000070 <tr><td><a href="https://wg21.link/LWG1214">1214</a></td><td>Insufficient/inconsistent key immutability requirements for associative containers</td><td>Urbana</td><td></td></tr>
Marshall Clowbee8eb92017-07-16 23:59:23 +000071-->
Stephan T. Lavavej4e745042017-08-31 17:59:33 +000072 <tr><td><a href="https://wg21.link/LWG2070">2070</a></td><td><tt>allocate_shared</tt> should use <tt>allocator_traits&lt;A&gt;::construct</tt></td><td>Toronto</td><td>Resolved by <a href="https://wg21.link/P0674R1">P0674R1</a></td></tr>
73 <tr><td><a href="https://wg21.link/LWG2444">2444</a></td><td>Inconsistent complexity for <tt>std::sort_heap</tt></td><td>Toronto</td><td></td></tr>
74 <tr><td><a href="https://wg21.link/LWG2593">2593</a></td><td>Moved-from state of Allocators</td><td>Toronto</td><td></td></tr>
75 <tr><td><a href="https://wg21.link/LWG2597">2597</a></td><td><tt>std::log</tt> misspecified for complex numbers</td><td>Toronto</td><td></td></tr>
76 <tr><td><a href="https://wg21.link/LWG2783">2783</a></td><td><tt>stack::emplace()</tt> and <tt>queue::emplace()</tt> should return <tt>decltype(auto)</tt></td><td>Toronto</td><td></td></tr>
77 <tr><td><a href="https://wg21.link/LWG2932">2932</a></td><td>Constraints on parallel algorithm implementations are underspecified</td><td>Toronto</td><td></td></tr>
78 <tr><td><a href="https://wg21.link/LWG2937">2937</a></td><td>Is <tt>equivalent("existing_thing", "not_existing_thing")</tt> an error</td><td>Toronto</td><td>Complete</td></tr>
79 <tr><td><a href="https://wg21.link/LWG2940">2940</a></td><td><tt>result_of</tt> specification also needs a little cleanup</td><td>Toronto</td><td></td></tr>
80 <tr><td><a href="https://wg21.link/LWG2942">2942</a></td><td>LWG 2873's resolution missed <tt>weak_ptr::owner_before</tt></td><td>Toronto</td><td>Complete</td></tr>
81 <tr><td><a href="https://wg21.link/LWG2954">2954</a></td><td>Specialization of the convenience variable templates should be prohibited</td><td>Toronto</td><td>Complete</td></tr>
82 <tr><td><a href="https://wg21.link/LWG2961">2961</a></td><td>Bad postcondition for <tt>set_default_resource</tt></td><td>Toronto</td><td></td></tr>
83 <tr><td><a href="https://wg21.link/LWG2966">2966</a></td><td>Incomplete resolution of US 74</td><td>Toronto</td><td><i>Nothing to do</i></td></tr>
84 <tr><td><a href="https://wg21.link/LWG2974">2974</a></td><td>Diagnose out of bounds <tt>tuple_element/variant_alternative</tt></td><td>Toronto</td><td>Complete</td></tr>
Marshall Clowbee8eb92017-07-16 23:59:23 +000085
86<!-- <tr><td></td><td></td><td></td><td></td></tr> -->
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88
89 <p>Last Updated: 16-Jul-2017</p>
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